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Usually, HIV antibodies start to appear in the blood around 14 weeks after an individual has been infected with HIV. In rare cases, it may take longer than 14 weeks for HIV antibodies to appear in human blood.

Therefore, it is recommended to wait for 14 weeks after you have been exposed to the virus before being tested. This wait period is recommended whether or not the exposure occurred during unsafe sex with someone who is infected, or while sharing needles with someone who is infected, or through another known means of transmission.If the test results are negative, the test may be repeated after six months from the time of exposure, provided that the person being tested does not engage in any risky activities during that six month period.